What are the following sequence of steps taken in designing a fuzzy logic…
2016
What are the following sequence of steps taken in designing a fuzzy logic machine ?
- A.
Fuzzification → Rule evaluation → Defuzzification
- B.
Fuzzification → Defuzzification → Rule evaluation
- C.
Rule evaluation → Fuzzification → Defuzzification
- D.
Rule evaluation → Defuzzification → Fuzzification
Attempted by 90 students.
Show answer & explanation
Correct answer: A
Correct sequence: Fuzzification → Rule evaluation → Defuzzification
Step-by-step explanation:
Fuzzification: Convert crisp (precise) input values into degrees of membership in predefined fuzzy sets. This produces the fuzzy inputs needed for inference.
Rule evaluation (fuzzy inference): Apply the fuzzy rules to the fuzzified inputs, combine results (using fuzzy operators), and aggregate the fuzzy outputs for each rule.
Defuzzification: Convert the aggregated fuzzy output set into a single crisp (numeric) output. Common methods include centroid (center of gravity) and mean of maxima.
Why this order matters: Fuzzification must come first to produce fuzzy inputs for the rules; rule evaluation produces fuzzy outputs that must then be defuzzified to obtain a usable crisp decision.